Mohs Scale Hardness Pencils - Set of 5

$125.00
In Stock


Calculate Shipping


SET OF 5 MOHS SCALE HARDNESS PENCILS

This set of 5 hardness pencils covers the range of Moh's Scales from 5 through to 9.

Hardness pencils are pencils with a tip made of one of the minerals on Mohs scale. These pencils are used to try and scratch a stone and observe if the pencils can scratch the gem.

Since this is a destructive method (it leaves a scratch), this test is mostly used on pieces of rough or on a inconspicuous place on the gemstone.

The gemstone is tested with a pencil of low hardness (starting at 4 or lower) to try to put a tiny scratch on the stone without applying pressure. If no scratch is observed, one repeats this process with a pencil of higher hardness (in this case 5) and so on until one arrives at the pencil that is able to put a tiny scratch on the stone.

For instance, if one could not scratch the mineral with pencil no.7 but it would leave a scratch with pencil no.8, the hardness of the mineral must be between 7 and 8 on Mohs scale.

 

(GIHP5)

SKU GIHP5
Brand GemPro
Shipping Weight 0.1100kg
Shipping Width 0.025m
Shipping Height 0.140m
Shipping Length 0.150m
Shipping Cubic 0.000525m3

Be The First To Review This Product!

Help other Gemcuts users shop smarter by writing reviews for products you have purchased.

Write a product review


Others Also Bought



More From This Category